Raman-enhanced nonlinear effects on third harmonic generation in plasma using Hermite cosh Gaussian laser beam

IF 4 3区工程技术 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC Optical and Quantum Electronics Pub Date : 2025-04-03 DOI:10.1007/s11082-025-08143-x

Taruna Azad, Niti Kant, Alireza Paknezhad, Oriza Kamboj

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Abstract

This paper investigates the third harmonic generation (THG) process due to Stimulated Raman Scattering (SRS) in a magnetized plasma using a Hermite cosh Gaussian laser beam (HchG). The unique intensity profile of the HchG laser beam interacts with the plasma which leads to the generation of plasma waves and sideband electromagnetic waves i.e. stokes and Anti-stokes waves. This interaction leads to density perturbation inside the plasma, which couples with the laser wave, resulting in THG. A nonlinear wave equation, along with the equation of motion for plasma electrons, is employed to derive the dispersion relation and analyze the growth rate of the SRS instability. The study incorporates the effects of a static magnetic field, focusing on cold and underdense plasma conditions. The results demonstrate that the HchG beam’s spatial profile enhances the efficiency of THG and significantly impacts the growth rate and characteristics of SRS, suggesting that modulating laser beam profiles can effectively control plasma dynamics.

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利用赫米特余弦高斯激光束对等离子体中三次谐波生成的拉曼增强非线性效应

本文利用厄米特柯希高斯激光束研究磁化等离子体中受激拉曼散射（SRS）引起的三次谐波产生过程。HchG激光束的独特强度分布与等离子体相互作用，导致等离子体波和边带电磁波的产生，即斯托克斯波和反斯托克斯波。这种相互作用导致等离子体内部的密度扰动，它与激光波耦合，导致THG。利用非线性波动方程和等离子体电子的运动方程推导了色散关系，并分析了SRS不稳定性的增长速度。该研究结合了静态磁场的影响，重点关注冷和低密度等离子体条件。结果表明，HchG光束的空间轮廓提高了THG的效率，显著影响了SRS的生长速度和特性，表明调制激光束轮廓可以有效地控制等离子体动力学。

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来源期刊

Optical and Quantum Electronics 工程技术-工程：电子与电气

CiteScore

4.60

自引率

20.00%

发文量

810

审稿时长

3.8 months

期刊介绍： Optical and Quantum Electronics provides an international forum for the publication of original research papers, tutorial reviews and letters in such fields as optical physics, optical engineering and optoelectronics. Special issues are published on topics of current interest. Optical and Quantum Electronics is published monthly. It is concerned with the technology and physics of optical systems, components and devices, i.e., with topics such as: optical fibres; semiconductor lasers and LEDs; light detection and imaging devices; nanophotonics; photonic integration and optoelectronic integrated circuits; silicon photonics; displays; optical communications from devices to systems; materials for photonics (e.g. semiconductors, glasses, graphene); the physics and simulation of optical devices and systems; nanotechnologies in photonics (including engineered nano-structures such as photonic crystals, sub-wavelength photonic structures, metamaterials, and plasmonics); advanced quantum and optoelectronic applications (e.g. quantum computing, memory and communications, quantum sensing and quantum dots); photonic sensors and bio-sensors; Terahertz phenomena; non-linear optics and ultrafast phenomena; green photonics.